org.w3c.dom
Interface Notation

This interface represents a notation declared in the DTD. A notation either
declares, by name, the format of an unparsed entity (see section 4.7 of the XML 1.0 specification [XML 1.0]), or is
used for formal declaration of processing instruction targets (see section 2.6 of the XML 1.0 specification [XML 1.0]). The
nodeName attribute inherited from Node is set
to the declared name of the notation.

The DOM Core does not support editing Notation nodes; they
are therefore readonly.